284 RATHBUN 



terior part flat and thick, the anterior and outer part thin, hollow 

 beneath and with a sharp median crest above. Marginal crests of the 

 basal segment of the antennae thin and finely denticulate. Pterygo- 

 stomian region armed with a tubercle. Sternum and outer portions of 

 the abdomen covered with pearly granules. 



The palms of the chelipeds are strongly inflated; fingers narrowly 

 gaping when closed. The ambulatory legs diminish rapidly and 

 uniformly in length from the first to the fourth pair. The dactyli vary 

 little in length; the distal portion of the propodi of last three pairs is 

 slightly thickened and curved. 



Dimensions. — Male, length 15 mm., width 11. 



Type Locality. — Tagus Cove, Albemarle Island, 12 fathoms, one 

 male (U. S. Nat. Museum Cat. No. 24834). Two smaller males and 

 a female were taken at Tagus Cove on the reef north of Tagus Hill. 



Lissa aurivilliusi Rathbun. 



Tagus Cove, Albemarle Island, on reef north of Tagus Hill, March 

 16, I male. 



Distribution. — Off Lower California, 12 to 31 fathoms. 



Teleophrys cristulipes Stimpson. 



Tagus Cove, Albemarle Island, on reef north of Tagus Hill, March 

 16, I male. 



Distribution. — Lower California and Bay of Panama ; Pernambuco 

 and Maceio, Brazil; Fernando Noronha (Pocock). 



Mithrax bellii Gersttecker. 



Mithrax urstis Bell, Proc. Zobl. Soc. London, in, 171, 1835 ; Trans. Zool. 

 Soc. London, 11, 52, pi. x, f. 2 and 3, 1836. — A. Milne Edwards, 

 Crust. Reg. Max., 103, 1875. ^°t Cancer ursiis Herbst. 



Mithrax bellii G^KSTJECK^K, Arch. f. Natur., xxii, pt. i, 112, 1856. 



Black Bight, Albemarle Island, one male ; a fine specimen of a deep 

 rich crimson. Length 63.6 mm. width 65.4. The chelipeds, as 

 would be expected, are considerably larger than those of the female 

 figured by Bell ; the movable finger has a large tooth at its basal third. 

 The rostral horns are shorter than in Bell's figure, being in our speci- 

 men no longer than the horns of the basal antennal segment. 



Distribution. — Galapagos, 6 fathoms (type locality) ; Chile 

 (Miers). 



Mithrax nodosus Bell. 



Black Bight, Albemarle Island, Jan. 9, 2 males. 

 Tagus Cove, Albemarle Island, on reef north of Tagus Hill, March 

 16, 3 males, 2 females, 2 young. 



